Earthquake · reviewed by a seismologist
M 3.5mwr
Earthquake near Ponca City, OK
USGS: 9 km SE of Marland, Oklahoma
41 km (25 mi) N of Stillwater, OK · 122 km (76 mi) NNE of Oklahoma City, OK
- When
- 10:33 am CST on 28 January 2016 ()
- Where
- 23 km (14 mi) S of Ponca City, OK · earthquakes near Ponca City
- Magnitude
- M 3.5 (mwr)
- Depth
- 7.2 km below the surface
- Felt
- 72 reports · strongest reported intensity VI
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Noble County, 19 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2388 days ago
A magnitude 3.5 earthquake was recorded 23 km (14 mi) S of Ponca City, OK, at 10:33 am CST on 28 January 2016 (16:33 UTC). 72 people have reported feeling it to USGS. This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
Earthquakes near other towns within 30 km: McCord, Tonkawa.
How big was it?
This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 63,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
- Magna, Utah 2020 M 5.7 2,000× the energy of this one
- This earthquake M 3.5 about 2.7 tons of TNT
- Around the size people start to feel M 3.0 this one released 5.6× more
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 36.5004, -97.0742. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Noble County, OK | 19 km (12 mi) | SW | earthquakes near Noble County |
| Kay County, OK | 36 km (22 mi) | N | earthquakes near Kay County |
| Pawnee County, OK | 40 km (25 mi) | ESE | earthquakes near Pawnee County |
| Payne County, OK | 48 km (30 mi) | S | earthquakes near Payne County |
| Osage County, OK | 61 km (38 mi) | ENE | earthquakes near Osage County |
| Garfield County, OK | 65 km (41 mi) | WSW | earthquakes near Garfield County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
49 earthquakes have been recorded within 50 km since this one.
- 3.3 5 km W of Lucien, Oklahoma
- 2.9 17 km ESE of Marland, Oklahoma
- 2.7 8 km NNW of Morrison, Oklahoma
- 3.0 8 km S of Perry, Oklahoma
- 2.6 8 km S of Perry, Oklahoma
- 2.4 6 km NE of Orlando, Oklahoma
- 2.9 4 km W of Lucien, Oklahoma
- 2.5 4 km ESE of Covington, Oklahoma
- 2.8 5 km WNW of Lucien, Oklahoma
- 2.6 4 km ESE of Covington, Oklahoma
- 2.7 5 km ESE of Covington, Oklahoma
- 2.4 6 km W of Lucien, Oklahoma
- 2.6 5 km W of Lucien, Oklahoma
- 3.5 6 km WNW of Lucien, Oklahoma
- 3.8 5 km WNW of Lucien, Oklahoma
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.